From 96a0377cabada8eeed1ec157a11865ef6de4e0aa Mon Sep 17 00:00:00 2001
From: =?utf8?q?Manuel=20Carrasco=20Mo=C3=B1ino?=
 <manuel.carrasco.m@gmail.com>
Date: Sun, 14 Apr 2013 20:06:49 +0200
Subject: [PATCH] Fix a NPE in certain callback cases. Add a couple of useful
 and predefined functions.

---
 .../client/plugins/deferred/Callbacks.java    |  2 +-
 .../client/plugins/deferred/Deferred.java     | 40 ++++++++++++++++++-
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/gwtquery-core/src/main/java/com/google/gwt/query/client/plugins/deferred/Callbacks.java b/gwtquery-core/src/main/java/com/google/gwt/query/client/plugins/deferred/Callbacks.java
index c6d36d72..23ee2254 100644
--- a/gwtquery-core/src/main/java/com/google/gwt/query/client/plugins/deferred/Callbacks.java
+++ b/gwtquery-core/src/main/java/com/google/gwt/query/client/plugins/deferred/Callbacks.java
@@ -149,7 +149,7 @@ public class Callbacks {
   private boolean run(Object c, Object...o) {
     // Unbox array inside array when there is only an element.
     // It happens when running filters in Promise.then()
-    if (o.length == 1 && o[0].getClass().isArray()) {
+    if (o != null && o.length == 1 && o[0] != null && o[0].getClass().isArray()) {
       o = (Object[])o[0];
     }
     if (c instanceof Callback) {
diff --git a/gwtquery-core/src/main/java/com/google/gwt/query/client/plugins/deferred/Deferred.java b/gwtquery-core/src/main/java/com/google/gwt/query/client/plugins/deferred/Deferred.java
index e0257426..c804784f 100644
--- a/gwtquery-core/src/main/java/com/google/gwt/query/client/plugins/deferred/Deferred.java
+++ b/gwtquery-core/src/main/java/com/google/gwt/query/client/plugins/deferred/Deferred.java
@@ -87,10 +87,48 @@ public class Deferred implements Promise.Deferred {
         // run the function with the new args to resolve this deferred
         doIt.f();
       }
-    }    
+    }
     
     protected com.google.gwt.query.client.plugins.deferred.Deferred dfd;
 
+    /**
+     * Utility function which can be used inside classes extending this to
+     * resolve this deferred in a call to any other promise method.
+     *
+     * Example:
+     * <pre>
+     * new PromiseFunction() {
+     *   public void f(final Deferred dfd) {
+     *     anotherPromise.done( resolve );
+     *   }
+     * }
+     * </pre>
+     */
+    protected Function resolve = new Function() {
+      public void f() {
+        dfd.resolve(arguments);
+      };
+    };
+
+    /**
+     * Utility function which can be used inside classes extending this to
+     * reject this deferred in a call to any other promise method.
+     *
+     * Example:
+     * <pre>
+     * new PromiseFunction() {
+     *   public void f(final Deferred dfd) {
+     *     anotherPromise.done( reject );
+     *   }
+     * }
+     * </pre>
+     */
+    protected Function reject = new Function() {
+      public void f() {
+        dfd.reject(arguments);
+      };
+    };
+
     protected DeferredPromiseImpl() {
       dfd = new com.google.gwt.query.client.plugins.deferred.Deferred();
     }
-- 
2.39.5